diff --git a/.ci/check-whitespace.jl b/.ci/check-whitespace.jl
new file mode 100755
index 00000000..604af8dc
--- /dev/null
+++ b/.ci/check-whitespace.jl
@@ -0,0 +1,98 @@
+#!/usr/bin/env julia
+
+const patterns = split("""
+    *.jl
+    *.md
+    *.yml
+    *Makefile
+""")
+
+const is_gha = something(tryparse(Bool, get(ENV, "GITHUB_ACTIONS", "false")), false)
+
+# Note: `git ls-files` gives `/` as a path separator on Windows,
+#   so we just use `/` for all platforms.
+allow_tabs(path) =
+    endswith(path, "Makefile") ||
+    endswith(path, ".make") ||
+    endswith(path, ".mk")
+
+function check_whitespace()
+    errors = Set{Tuple{String,Int,String}}()
+    files_to_check = filter(arg -> !startswith(arg, "-"), ARGS)
+    if isempty(files_to_check)
+        if "--stdin" in ARGS
+            files_to_check = collect(eachline(stdin))
+        else
+            files_to_check = collect(eachline(`git ls-files -- $patterns`))
+        end
+    end
+
+    files_fixed = 0
+    if "--fix" in ARGS
+        for path in files_to_check
+            content = newcontent = read(path, String)
+            isempty(content) && continue
+            if !allow_tabs(path)
+                tabpattern = r"^([ \t]+)"m => (x -> replace(x, r"((?: {4})*)( *\t)" => s"\1    ")) # Replace tab sequences at start of line after any number of 4-space groups
+                newcontent = replace(newcontent, tabpattern)
+            end
+            newcontent = replace(newcontent,
+                r"\s*$" => '\n',                # Remove trailing whitespace and normalize line ending at eof
+                r"\s*?[\r\n]" => '\n',          # Remove trailing whitespace and normalize line endings on each line
+                r"\xa0" => ' '                  # Replace non-breaking spaces
+            )
+            if content != newcontent
+                write(path, newcontent)
+                files_fixed += 1
+            end
+        end
+        if files_fixed > 0
+            println(stderr, "Fixed whitespace issues in $files_fixed files.")
+        end
+    end
+
+    for path in files_to_check
+        lineno = 0
+        non_blank = 0
+
+        file_err(msg) = push!(errors, (path, 0, msg))
+        line_err(msg) = push!(errors, (path, lineno, msg))
+
+        isfile(path) || continue
+        for line in eachline(path, keep=true)
+            lineno += 1
+            contains(line, '\r')   && file_err("non-UNIX line endings")
+            contains(line, '\ua0') && line_err("non-breaking space")
+            allow_tabs(path) ||
+                contains(line, '\t')   && line_err("tab")
+            endswith(line, '\n')   || line_err("no trailing newline")
+            line = chomp(line)
+            endswith(line, r"\s")  && line_err("trailing whitespace")
+            contains(line, r"\S")  && (non_blank = lineno)
+        end
+        non_blank < lineno         && line_err("trailing blank lines")
+    end
+
+    if isempty(errors)
+        println(stderr, "Whitespace check found no issues.")
+        exit(0)
+    else
+        println(stderr, "Whitespace check found $(length(errors)) issues:")
+        for (path, lineno, msg) in sort!(collect(errors))
+            if lineno == 0
+                println(stderr, "$path -- $msg")
+                if is_gha
+                    println(stdout, "::warning title=Whitespace check,file=", path, "::", msg)
+                end
+            else
+                println(stderr, "$path:$lineno -- $msg")
+                if is_gha
+                    println(stdout, "::warning title=Whitespace check,file=", path, ",line=", lineno, "::", msg)
+                end
+            end
+        end
+        exit(1)
+    end
+end
+
+check_whitespace()
diff --git a/.github/workflows/Whitespace.yml b/.github/workflows/Whitespace.yml
new file mode 100644
index 00000000..3931cba2
--- /dev/null
+++ b/.github/workflows/Whitespace.yml
@@ -0,0 +1,26 @@
+name: Whitespace
+
+permissions: {}
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  whitespace:
+    name: Check whitespace
+    runs-on: ubuntu-latest
+    timeout-minutes: 2
+    steps:
+      - name: Checkout the JuliaSparse/SparseArrays.jl repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: julia-actions/setup-julia@f6f565d9f7cf12f53dc8045742460d6260ad3b39 # v3.0.1
+        with:
+          version: '1.11.6'
+      - name: Check whitespace
+        run: |
+          julia .ci/check-whitespace.jl
diff --git a/gen/Makefile b/gen/Makefile
index e19103fc..132889fc 100755
--- a/gen/Makefile
+++ b/gen/Makefile
@@ -7,7 +7,7 @@ all: clean download
 	julia --project generator.jl ./SuiteSparse-$(VER)
 
 clean:
-	rm -fr *.tar.gz SuiteSparse* 
+	rm -fr *.tar.gz SuiteSparse*
 
 download:
 	curl -L -O https://github.com/JuliaBinaryWrappers/SuiteSparse_jll.jl/releases/download/SuiteSparse-v$(VER)%2B0/SuiteSparse.v$(VER).x86_64-linux-gnu.tar.gz
diff --git a/src/SparseArrays.jl b/src/SparseArrays.jl
index 46b9c01c..2418f9e2 100644
--- a/src/SparseArrays.jl
+++ b/src/SparseArrays.jl
@@ -85,7 +85,7 @@ if Base.USE_GPL_LIBS
     include("solvers/spqr.jl")
 end
 
-zero(a::AbstractSparseArray) = spzeros(eltype(a), size(a)...)
+zero(a::AbstractSparseArray{Tv,Ti}) where {Tv,Ti} = spzeros(Tv, Ti, size(a)...)
 
 LinearAlgebra.diagzero(D::Diagonal{<:AbstractSparseMatrix{T}},i,j) where {T} =
     spzeros(T, size(D.diag[i], 1), size(D.diag[j], 2))
diff --git a/src/solvers/cholmod.jl b/src/solvers/cholmod.jl
index 504f5d43..797c7c03 100644
--- a/src/solvers/cholmod.jl
+++ b/src/solvers/cholmod.jl
@@ -990,7 +990,7 @@ function Sparse(A::SparseMatrixCSC{<:Union{ComplexF16, ComplexF32}}, stype::Inte
 end
 
 # convert SparseVectors into CHOLMOD Sparse types through a mx1 CSC matrix
-Sparse(A::SparseVector) = Sparse(SparseMatrixCSC(A))
+Sparse(A::SparseVector) = Sparse(SparseMatrixCSC(A), 0)
 function Sparse{Tv, Ti}(A::SparseMatrixCSC) where {Tv<:VTypes, Ti<:ITypes}
     o = Sparse{Tv, Ti}(A, 0)
     # check if array is symmetric and change stype if it is
@@ -1135,6 +1135,7 @@ function SparseVector{Tv, Ti}(A::Sparse{Tv, Ti}) where {Tv, Ti<:ITypes}
     end
     args = _extract_args(s, Tv)
     s.sorted == 0 && _sort_buffers!(args...);
+    _trim_nz_builder!(args...)
     return SparseVector(args[1], args[4], args[5])
 end
 
diff --git a/src/solvers/spqr.jl b/src/solvers/spqr.jl
index 5e9fa07e..72ebe550 100644
--- a/src/solvers/spqr.jl
+++ b/src/solvers/spqr.jl
@@ -85,7 +85,7 @@ function _qr!(ordering::Integer, tol::Real, econ::Integer, getCTX::Integer,
         # Free memory allocated by SPQR. This call will make sure that the
         # correct deallocator function is called and that the memory count in
         # the common struct is updated
-        Ti === Int64 ? 
+        Ti === Int64 ?
             cholmod_l_free(n, sizeof(Ti), e, CHOLMOD.getcommon(Ti)) :
             cholmod_free(n, sizeof(Ti), e, CHOLMOD.getcommon(Ti))
     end
@@ -100,7 +100,7 @@ function _qr!(ordering::Integer, tol::Real, econ::Integer, getCTX::Integer,
         # Free memory allocated by SPQR. This call will make sure that the
         # correct deallocator function is called and that the memory count in
         # the common struct is updated
-        Ti === Int64 ? 
+        Ti === Int64 ?
             cholmod_l_free(m, sizeof(Ti), hpinv, CHOLMOD.getcommon(Ti)) :
             cholmod_free(m, sizeof(Ti), hpinv, CHOLMOD.getcommon(Ti))
     end
diff --git a/src/solvers/umfpack.jl b/src/solvers/umfpack.jl
index 7a8458d9..fc4b9c17 100644
--- a/src/solvers/umfpack.jl
+++ b/src/solvers/umfpack.jl
@@ -471,7 +471,8 @@ function lu!(F::UmfpackLU{Tv, Ti}, S::AbstractSparseMatrixCSC;
     return lu!(F; reuse_symbolic, check, q)
 end
 
-function lu!(F::UmfpackLU; check::Bool=true, reuse_symbolic::Bool=true, q=nothing)
+function lu!(F::UmfpackLU{Tv, Ti}; check::Bool=true, reuse_symbolic::Bool=true,
+  q=nothing) where {Tv, Ti}
     if !reuse_symbolic && _isnotnull(F.symbolic)
         F.symbolic = Symbolic{Tv, Ti}(C_NULL)
     end
diff --git a/src/sparseconvert.jl b/src/sparseconvert.jl
index 479654b7..80854331 100644
--- a/src/sparseconvert.jl
+++ b/src/sparseconvert.jl
@@ -280,4 +280,3 @@ function _sparse_gen(m, n, newcolptr, newrowval, newnzval)
     newcolptr[1] = 1
     SparseMatrixCSC(m, n, newcolptr, newrowval, newnzval)
 end
-
diff --git a/src/sparsematrix.jl b/src/sparsematrix.jl
index 6aadb355..73dd2ba8 100644
--- a/src/sparsematrix.jl
+++ b/src/sparsematrix.jl
@@ -4513,7 +4513,7 @@ function Base.swaprows!(A::AbstractSparseMatrixCSC, i, j)
         iidx = searchsortedfirst(@view(rows[rr]), i)
         has_i = iidx <= length(rr) && rows[rr[iidx]] == i
 
-        jrange = has_i ? (iidx:last(rr)) : rr
+        jrange = has_i ? (rr[iidx]:last(rr)) : rr
         jidx = searchsortedlast(@view(rows[jrange]), j)
         has_j = jidx != 0 && rows[jrange[jidx]] == j
 
@@ -4527,18 +4527,16 @@ function Base.swaprows!(A::AbstractSparseMatrixCSC, i, j)
             # Update the rowval and then rotate both nonzeros
             # and the remaining rowvals into the correct place
             rows[rr[iidx]] = j
-            jidx == 0 && continue
             rotate_range = rr[iidx]:jrange[jidx]
-            circshift!(@view(vals[rotate_range]), 1)
-            circshift!(@view(rows[rotate_range]), 1)
+            circshift!(@view(vals[rotate_range]), -1)
+            circshift!(@view(rows[rotate_range]), -1)
         else
             # Same as i, but in the opposite direction
             @assert has_j
             rows[jrange[jidx]] = i
-            iidx > length(rr) && continue
             rotate_range = rr[iidx]:jrange[jidx]
-            circshift!(@view(vals[rotate_range]), -1)
-            circshift!(@view(rows[rotate_range]), -1)
+            circshift!(@view(vals[rotate_range]), 1)
+            circshift!(@view(rows[rotate_range]), 1)
         end
     end
     return nothing
diff --git a/src/sparsevector.jl b/src/sparsevector.jl
index 1d7daf0b..65077517 100644
--- a/src/sparsevector.jl
+++ b/src/sparsevector.jl
@@ -1704,7 +1704,7 @@ for (fun, comp, word) in ((:findmin, :(<), "minimum"), (:findmax, :(>), "maximum
         m == n && return val, index
         nzinds = nonzeroinds(x)
         zeroval = f(zero(T))
-        $comp(val, zeroval) && return val, nzinds[index]
+        ($comp(val, zeroval) || isnan(val)) && return val, nzinds[index]
         # we need to find the first zero, which could be stored or implicit
         # we try to avoid findfirst(iszero, x)
         sindex = findfirst(_iszero, nzvals) # first stored zero, if any
diff --git a/test/cholmod.jl b/test/cholmod.jl
index 4224c002..f5e9ef93 100644
--- a/test/cholmod.jl
+++ b/test/cholmod.jl
@@ -806,6 +806,14 @@ end
     @test chI \ sparseI ≈ sparseI
 end
 
+@testset "Issue 630" begin
+    sparseI = sparse(1.0I, 1, 1)
+    @test cholesky(sparseI) \ sparse([1.0]) == [1]
+    sparseI = sparse(1.0I, 2, 2)
+    res = cholesky(sparseI) \ spzeros(2)
+    @test isempty(nonzeros(res))
+end
+
 @testset "Real factorization and complex rhs" begin
     A = sprandn(5, 5, 0.4) |> t -> t't + I
     B = complex.(randn(5, 5), randn(5, 5))
@@ -1017,7 +1025,7 @@ end
     end
 
     f = ones(size(K, 1))
-    u = K \ f
+    u = K \ f
     residual = norm(f - K * u) / norm(f)
     @test residual < 1e-6
 end
diff --git a/test/fixed.jl b/test/fixed.jl
index 59c10346..e477363d 100644
--- a/test/fixed.jl
+++ b/test/fixed.jl
@@ -118,7 +118,7 @@ end
     @test f(x, y, z) == 0
     t = similar(x)
     @test typeof(t) == typeof(x)
-    @test struct_eq(t, x)    
+    @test struct_eq(t, x)
 end
 
 @testset "Issue #190" begin
diff --git a/test/forbidproperties.jl b/test/forbidproperties.jl
index 6550462c..d07d9cab 100644
--- a/test/forbidproperties.jl
+++ b/test/forbidproperties.jl
@@ -1,5 +1,18 @@
 # This file is a part of Julia. License is MIT: https://julialang.org/license
 
 using SparseArrays
-Base.getproperty(::SparseMatrixCSC, ::Symbol) = error("use accessor function")
-Base.getproperty(::SparseVector, ::Symbol) = error("use accessor function")
+# Only define each `getproperty` override if it isn't already defined. This
+# file is `include`d from multiple sibling test modules, and without this
+# guard each subsequent include would re-set the same `Base` methods,
+# producing spurious method-overwrite warnings (depending on `--warn-overwrite`).
+# `hasmethod` is not sufficient here because the generic `Base.getproperty`
+# fallback for `Any` always exists; we instead check whether `which` returns
+# that fallback method.
+let fallback = which(Base.getproperty, Tuple{Any, Symbol})
+    if which(Base.getproperty, Tuple{SparseMatrixCSC, Symbol}) === fallback
+        Base.getproperty(::SparseMatrixCSC, ::Symbol) = error("use accessor function")
+    end
+    if which(Base.getproperty, Tuple{SparseVector, Symbol}) === fallback
+        Base.getproperty(::SparseVector, ::Symbol) = error("use accessor function")
+    end
+end
diff --git a/test/issues.jl b/test/issues.jl
index f198812a..9f46a639 100644
--- a/test/issues.jl
+++ b/test/issues.jl
@@ -805,6 +805,13 @@ end
                        7 16 4])
 end
 
+@testset "Issue #574" begin
+    a = spzeros(Float32, Int16, 2, 3)
+    v = spzeros(Float32, Int16, 2)
+    @test eltype(rowvals(zero(a))) <: Int16
+    @test eltype(rowvals(zero(v))) <: Int16
+end
+
 end # SparseTestsBase
 
 end # module
diff --git a/test/sparsematrix_constructors_indexing.jl b/test/sparsematrix_constructors_indexing.jl
index a0396f40..52b09677 100644
--- a/test/sparsematrix_constructors_indexing.jl
+++ b/test/sparsematrix_constructors_indexing.jl
@@ -1426,6 +1426,21 @@ using Base: swaprows!, swapcols!
         f!(Scopy, i, j); f!(Sdense, i, j)
         @test Scopy == Sdense
     end
+
+    for (A, i, j) in (
+            (sparse([1.0  2.0  3.0;
+                     0.0  0.0  0.0;
+                     4.0  5.0  6.0]), 1, 2),
+            (sparse([1.0  0.0  5.0;
+                     0.0  2.0  0.0;
+                     0.0  3.0  6.0;
+                     7.0  4.0  0.0]), 1, 2),
+            (sparse(reshape([1.0, 2.0, 3.0, 4.0, 0.0, 0.0], 6, 1)), 2, 6))
+        Scopy = copy(A)
+        Sdense = Array(A)
+        swaprows!(Scopy, i, j); swaprows!(Sdense, i, j)
+        @test Scopy == Sdense
+    end
 end
 
 @testset "sprandn with type $T" for T in (Float64, Float32, Float16, ComplexF64, ComplexF32, ComplexF16)
diff --git a/test/sparsevector.jl b/test/sparsevector.jl
index c91f0d69..a3ad5fe0 100644
--- a/test/sparsevector.jl
+++ b/test/sparsevector.jl
@@ -1052,6 +1052,11 @@ end
         @test all(!iszero, v)
         @test !any(iszero, v)
     end
+
+    let v = sparse([0, NaN]) #issue #714
+        @test findmin(v) === (NaN, 2)
+        @test findmax(v) === (NaN, 2)
+    end
 end
 
 ### linalg
diff --git a/test/umfpack.jl b/test/umfpack.jl
index 59dc9041..0a4525e2 100644
--- a/test/umfpack.jl
+++ b/test/umfpack.jl
@@ -408,7 +408,7 @@ end
         umfpack_report(x.b)
     end
 
-    @testset "Reuse symbolic LU factorization" begin
+    @testset "Do/do not reuse symbolic LU factorization" for reuse ∈ (true, false)
         A1 = sparse(increment!([0,4,1,1,2,2,0,1,2,3,4,4]),
                     increment!([0,4,0,2,1,2,1,4,3,2,1,2]),
                     [2.,1.,3.,4.,-1.,-3.,3.,9.,2.,1.,4.,2.], 5, 5)
@@ -420,7 +420,7 @@ end
                 b = Tv[8., 45., -3., 3., 19.]
                 F = lu(A)
                 umfpack_report(F)
-                lu!(F, B)
+                lu!(F, B; reuse_symbolic=reuse)
                 umfpack_report(F)
                 @test F\b ≈ B\b ≈ Matrix(B)\b
 
@@ -429,14 +429,20 @@ end
                 C[4, 3] = Tv(0)
                 F = lu(A)
                 umfpack_report(F)
-                @test_throws SingularException lu!(F, C)
+                @test_throws SingularException lu!(F, C; reuse_symbolic=reuse)
                 # change of nonzero pattern
                 D = copy(B)
                 D[5, 1] = Tv(1.0)
                 F = lu(A)
                 umfpack_report(F)
-                @test_throws ArgumentError lu!(F, D)
-                umfpack_report(F)
+                if reuse
+                    @test_throws ArgumentError lu!(F, D; reuse_symbolic=reuse)
+                    umfpack_report(F)
+                else
+                    lu!(F, D; reuse_symbolic=reuse)
+                    umfpack_report(F)
+                    @test F\b ≈ D\b ≈ Matrix(D)\b
+                end
             end
         end
     end